Electrosurgical unit

Details Electrosurgical unit Electrosurgical unit

1977-01-21

1978-11-21

Cohen, Lee S.

Surgery

Truss

Pad

12830317, 128422, A61B 1736, A61N 300

Patent

active

041261372

ABSTRACT:
An electrosurgical unit having a feedback control circuit for providing control of the power amplifier of the unit so power delivered to tissue presented between the active and return electrodes of the unit will be substantially constant over the range of impedance presented by various tissues that are encountered. The feedback signal to the power amplifier is determined from a comparison of a power level reference signal and the mathematical product of two signals which are derived from a sensed current in the unit that is directly related to current delivered to tissue and a sensed voltage that is directly related to voltage delivered to tissue. A non-linear compensation circuit is also disclosed for use in the feedback circuit.

REFERENCES:
patent: 3127895 (1964-04-01), Kendall et al.
patent: 3523539 (1970-08-01), Lavezzo et al.
patent: 3601126 (1971-08-01), Estes
patent: 3791373 (1974-02-01), Winkler et al.
patent: 3886950 (1975-06-01), Ukkestad
patent: 3923063 (1975-12-01), Andrews et al.
patent: 3964487 (1976-06-01), Judson
patent: 4057063 (1977-11-01), Gieles et al.

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